class Student(object): 
    def __init__(self, name, score):
        self.name = name
        self.score = score
 
    def print_score(self):
        print('%s: %s' % (self.name, self.score))
 
    def get_grade(self):
        if self.score >= 90:
            return 'A'
        elif self.score >= 60:
            return 'B'
        else:
            return 'C'
 
bart = Student('Bart Simpson', 59)
lisa = Student('Lisa Simpson', 87)
 
print('bart.name =', bart.name)
print('bart.score =', bart.score)
bart.print_score()
 
print('grade of Bart:', bart.get_grade())
print('grade of Lisa:', lisa.get_grade())
